The context menu commands Edit in PARTproject [Edit in PARTproject...]..., Snap [Zoom] and Transparency are available at assembly level. The dummy start part can be selected on the right-hand side of the dialog.
Edit in PARTproject [Edit in PARTproject...]...: The view changes to PARTproject and the desired project is selected.
Snap [Zoom]: The display of the assembly is adapted to the size of the window.
Transparency: This option allows you to temporarily hide parts in assemblies and make them visible again for a better overview.